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Asa Gen/ PP > ASA Powerplant > Flashcards

ASA Powerplant Flashcards

(68 cards)

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1
Q

What must be inspected to determine the airworthiness of an engine installation?

A

The propeller, lubrication system, ignition system, fuel metering system, cooling system, and the exhaust system

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2
Q

Where can you find the correct grade of fuel and amount of engine lubricating oil for an aircraft engine?

A

In the type data certificate sheets for the aircraft

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3
Q

What are the basic steps for troubleshooting an engine installation?

A
  1. Know how the system should operate
  2. Observe how the system is operating
  3. Divide the system into smaller parts to find the trouble
  4. Look for the obvious problems first
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4
Q

Where do you find instructions for removing an engine from an aircraft?

A

In the AMM

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5
Q

What must be done to the nose wheel airplane before removing the engine?

A

The tail of the airplane must be supported

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6
Q

what should be used to cover the ends of fuel and oil lines that have been disconnected from the engine?

A

The correct plugs or caps. Never cover the end of a line with tape

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7
Q

What is meant by a QEC engine assembly?

A

An engine that has been prepared for a quick engine change. The engine on its mount and all of the accessories are installed. A minimum of time is required to change engines. All that is needed is for the controls, wiring, and fluid lines to be connected to the firewall.

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8
Q

What is meant by rigging the engine controls so they have some “cushion”?

A

The control on the engine component must contact its stop before the control handle in the flight deck reaches its stop. This causes the control handle to spring back a slight amount when it is moved to the extent of its travel.

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9
Q

What are two ways of pre-oiling an engine?

A

A. Before the sparkplugs are installed and after the oil tank or sump is filled, turn the engine over with the starter until oil runs out of the fitting to which the oil pressure gauge connects
B. Use a pre-oiler tank. Air pressure forces oil through all of the passages until some of it flows from the oil pressure gauge fitting

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10
Q

How are the four strokes of a reciprocating engine similar to the sections of a turbine engine?

A

Intake=air inlet section, compression= compressor section, ignition and power= combustion and turbine sections, exhaust= exhaust section

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11
Q

What type of turbojet engine is commonly used in commercial aviation due to lower noise and better fuel consumption?

A

High bypass turbofan engines

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12
Q

where are most APUs located in modern jet transport aircraft?

A

In the tail cone of the fuselage

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13
Q

What is the function of an APU?

A

An APU provides electrical power and compressed air when the main engines are not operating

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14
Q

What are two sources of compressed air from an APU?

A

From bleed air from the APU turbine compressor, or from a load compressor driven by a free turbine in the engine

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15
Q

Where in maintenance information based on the ATA-100 system would you fine instructions for inspecting and servicing the engine of an airborne APU?

A

In section 49-20

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16
Q

How is most of the troubleshooting done for a modern APU?

A

By the fault codes generated by the FADEC

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17
Q

What ensures that an APU will not be shut down while its too hot?

A

The APU fuel control incorporates an automatic time-delay feature that closes the bleed air valve to remove most of the load and reduce APU temperature before it is shut down

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18
Q

What prevents the APU exceeding its safe operating limits when the bled air valve is wide open?

A

The FADEC monitors the load and regulates the fuel going to the APU to prevent it from exceeding its safe limits

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19
Q

What document would you use to find the safety procedures to follow when replacing an igniter plug in the APU engine?

A

The maintenance manual for the APU

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20
Q

What are three-types of flow-indicating systems used for turbine engines?

A

Vane-type flow meters, synchronous mass-type flow meters, and electronic motorless mass flow meters

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21
Q

What do mass flow systems measure?

A

The mass of the flow. This is affected by the density of the fuel which is in turn affected by the fuel temperature

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22
Q

In what units is an electronic motorless flow meters system calibrated?

A

Pounds per hour of fuel flow

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23
Q

What is indicated in a turbine engine if the fuel flow for all conditions is high?

A

If there are other instrument abnormalities, there are possibly damaged turbine components

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24
Q

Who is authorized to repair a fuel flow indicating system?

A

The components can be repaired only by an FAA approved repair station certificated for the particular instruments

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25
Where can you find the electrical power requirements for a fuel flow indicating system?
In the AMM
26
Where in the fuel system is the fuel flow transmitter located?
Between the fuel nozzles and the fuel control
27
What kind of indicating systems is used to measure oil temperature in a small, single-engined, genereal aviation airplane?
A seal system in which a bulb, partially filled with a highly volatile liquid, is installed inside the oil strainer, the bulb is connected to the pressure gauge by a copper tube. The pressure of the gas above the liquid is proportional to the temperature of the oil that surrounds the bulb, and the pressure gauge is calibrated in terms of temperature
28
What type of instrument is used for measuring oil temperature?
A ratiometer-type system
29
What should a thermocouple cylinder-head temperature indicator read when the engine is cold?
The same as the outside air temperature gauge
30
What is critical in the installation of the thermocouple leads for a cylinder-head temperature indicator, the length of the leads or their resistance?
The resistance is critical, it must have the resistance specified on the indicator. This is usually 2 or 8 ohms
31
What should a ratiometer temperature indicator read when the electrical power is off?
The pointer should be off scale on the low side
32
How does a ratiometer-type oil temperature gauge measure the temperature of the oil?
A ratiometer measures the resistance of the temperature bulb. The indicator is calibrated in degrees fahrenheit or celsius rather than in ohms
33
What kind of tachometer is used on most small single-engine airplanes?
A magnetic drag tachometer that is similar to an automobile speedometer
34
What would likely cause the pointer of a magnetic frag tachometer to oscillate?
Either a dry cable connecting the indicator to the engine, or a kink in the cable housing
35
What kind of tachometer is used on most large multi-engine airplanes?
A three-phase ac electric tachometer
36
What is used to indicate the engine rpm with a three-phase AC electric tachometer?
The frequency of the AC the tachometer generator produces
37
What happens in a jet transport aircraft when the fire-pull T-Handle for an engine is pulled?
1. The fuel shutoff valve is closed, and the generator field relay is tripped 2.The compressor bleed air valve is closed 3.The anti-ice valve is closed 4.The hydraulic supply shutoff is closed 5. The hydraulic pump low-pressure warning lights are turned off
38
What is indicated if the red discharge indicator for a fire extinguishing system is blown out?
The system has been discharge by an overheat condition
39
What is indicated if the yellow discharge indicator for a fire extinguishing system is blown out?
The system has been discharged by actuating the bottle discharge switch
40
What are two ways wires can be attached to the pins in a cannon plug?
1. Soldering the wires into pots on the pins and sockets 2. By crimping tapered pins onto the wires and inserting the pins into tapered holes in the pins and sockets
41
Why is stranded wire rather than solid wire used in most powerplant electrical systems?
Solid wire is likely to break when it is subjected to vibration
42
What two things must be considered in selection of wire size when making an electrical installation in an aircraft?
The current-carrying capability of the wire, and the voltage drop caused by current flowing through the wire
43
what is used to protect a wire bundle from chafing where it passes through a hole in a bulkhead or frame?
A grommet around the edges of the hole
44
How are electrical wires protected where they pass through an area of high temperature?
Wires passing through these areas are insulated with high temperature insulation, and the wires are enclosed in some type of protective conduit
45
what is the minimum separation allowed between a wire bundle and a fluid line that carries combustible fluid or oxygen?
Six inches whenever possible. If not practical, the wires should not run parallel to fuel or oxygen lines and a minimum of two inches must be maintained
46
which aircraft electrical circuit does not normally contain a fuse or circuit breaker?
The starter motor circuit
47
When should aircraft wiring be installed in a conduit?
When the wiring passes through an area in the aircraft where open wiring could likely be damaged, such as through the wheel well
48
What is meant by a trip-free circuit breaker?
A circuit breaker that opens a circuit any time an excessive amount of current flows, regardless of the position of the circuit breaker's operating handle
49
Which way should the toggle of a switch that controls the propeller pitch move to place the propeller in low pitch(High RPM)?
Forward
50
Why are protective covers placed over some switches in an aircraft electrical circuit?
To prevent the switch from being inadvertently actuated
51
what is straight mineral oil?
It is the lubricating oil as obtained by fractional distillation of crude oil. It does not have any additives
52
What is ashless dispersant oil(AD) oil?
A mineral lubricating oil containing additives that disperse the contaminates throughout the oil so they will not clump and clog oil passages. There are no ash-forming additives in AD oil.
53
what is synthetic oil?
a lubricating oil that is made by chemically changing the nature of an oil base to give it the needed characteristics. Synthetic oil is the primary oil for turbine engines
54
is automotive oil suitable for use in aircraft engines?
No, automotive and aviation oils are formulated for entirely different operating conditions
55
What is meant by a multiviscosity oil?
It is a lubricating oil with a viscosity index improver that increases the viscosity of the oil when it is hot and decreases the viscosity when it is cold
56
Where can you find the grade of engine oil specified for a particular aircraft ?
In the aircraft flight manual or the pilot's operating handbook for the aircraft
57
What type of ignition system is used on most turbine engines?
High-intensity, intermittent-duty, capacitor discharge ignition systems
58
How many igniters are used with most turbine engines
two
59
what are two types of ignition systems used in turbine engines?
High- voltage and low-voltage systems
60
With which type of turbine engine ignition system is a glow plug igniter used?
A low-voltage system
61
How is the strength of the magnet in a magneto checked?
The magneto is put on a a test stand and rotated at a specified speed. The breaker points are held open and the primary current is measured. The strength of the magnet determines the amount of primary current
62
In what position is the magnet in a magneto when the greatest change in flux density in the coil core takes place?
It is a few degrees beyond its neutral position. When it is in this position, the breaker points open and the primary current is interrupted. The flux change in the coil core is the greatest. AKA E-GAP position
63
In what position is the magnet in a magneto when the breaker points begin to open?
In its E-gap position, just a few degrees beyond its neutral position
64
What happens when the start switch for a turbine engine with a starter-generator is placed in the START position?
1. Current flows into the starter relay which closes and actuates the ignition exciter 2. Current flows through the series motor coils of the starter-generator and rotates the engine until it starts
65
What happens when the start switch for a turbine engine with a started-generator is placed in the Run position?
1. The starter relay opens, shutting off current to the ignition exciter and the motor windings in the starter-generator 2.The generator field relay is closed, connecting the voltage regulator to the starter- generator 3. the output of the generator flows to the bus through the generator circuit breaker
66
What is indicated if the starter relay chatters rather than locks in when the start switch is placed in the START position?
The battery voltage is too low to supply enough current to hold the relay engaged
67
What is the purpose of the shear section in an air-turbine drive shaft?
If the ratchet mechanism fails to release and the engine drives the starter to a speed higher than its design speed, the shear section will break and disconnect the starter from the engine
68
How is ice prevented from forming on the nose cowl, nose dome, and inlet guide vanes of a turbine engine?
Hot compressor bleed air flows through the passages in these compartments to elevate the surface temperatures sufficiently to prevent ice from forming

Asa Gen/ PP (2 decks)

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